This paper presents a compact dual-band printed antenna for 2.4/5.2 GHz WLAN applications. The radiating elements of the proposed antenna are composed of rectangular split-ring elements and metallic loadings placed appropriately between the rings. The antenna size is very compact (22 × 26 × 1.6 mm), and it can be integrated easily with other RF front-end circuits. It is demonstrated that the pr...

This paper presents a new miniature low cost planar RFID antenna designed @ 2.45 GHz. In order to validate the final structure, we have conducted a study on two antenna structures. The first one is based on a rectangular patch with a centred slot line, and the second one is based on a monopole antenna. By comparing the performances of both structures we have chosen the second one because due to...

A printed rectangular patch antenna (RPA) with a multiple rectangular shape slots with a rectangular ground plane has been proposed. Four rectangles of dimensions 7.3mm x 1mm is arranged in such a manner to achieve a bandwidth of 200 MHz having a centre frequency of 3.498GHz. This antenna is fabricated on the glass epoxy (FR4 lossy) of dielectric substrate with relative permittivity (€r) of 4.3...

In this paper, the design of a compact low cost switched-beam antenna for users in Wireless Local Area Networks (WLAN) is introduced. Four antenna elements are arranged in 2×2 lattice. The modification of beamforming network based on Butler matrix is originally proposed for 2×2 planar array. The design is verified through computer simulations and also the prototype of automatic switched-beam an...

A novel and simple antenna applicable to active RFID tags is designed. The designed antenna has been skillfully integrated with the active RFID tag circuit. The antenna consists of two parts. One part comprises stacked shorted patches and a ground plane. The other one is an active tag circuit mounted on the bottom of the antenna. By using the offset shorting posts technique, the proposed antenn...

In this paper, we propose a systematic simulation-based approach to estimate the reading distance of an RKE system. In our electromagnetic (EM) simulation, a receiving RKE antenna and a vehicle structure, including both exterior and interior, are modeled as piece-wise mesh triangles to obtain accurate radiation characteristics of the antenna mounted inside the vehicle. The reading distance is t...

This paper compares measurement with prediction of ITU-R Recommendation P.1546. This recommendation mainly depends on propagation curves which are based on the measurement result. The basic field strength is derived from the curve corresponding to transmitting antenna height, frequency and required distance and then correction factor is added to this. There are two important correction values i...

This paper deals with a method of the radiation pattern determination of the directional antennas. The method combining both the functional minimization method and the Fourier iterative algorithm is based on the phaseless near-field measurement on two plane surfaces. The method is used for a reconstruction of the phase distribution on the aperture of the measured antenna, and for the determinat...

This paper describes the experimental characterisation of MIMO propagation channels. The requirements for the measurement system are discussed and the developed system is described. At the second part of the paper the analysis methods of MIMO measurement results are introduced and results are presented both for outdoor and indoor for several different antenna configurations. The significance of...

This research studies the performance of a battery-free wireless antenna sensor for measuring crack propagation. In our previous work, a battery-free folded patch antenna was designed for wireless strain and crack sensing. When experiencing deformation, the antenna shape changes, causing shift in electromagnetic resonance frequency of the antenna. The wireless interrogation system utilizes the ...